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Mutual Coupling Compensation Techniques Used for Distance Protection of Parallel Lines

Author

Listed:
  • Michael O Donovan

    (Department of Electrical and Electronic, Munster Technological University, Bishopstown, T12 P928 Cork, Ireland)

  • Noel Barry

    (Department of Electrical and Electronic, Munster Technological University, Bishopstown, T12 P928 Cork, Ireland)

  • Joe Connell

    (Department of Electrical and Electronic, Munster Technological University, Bishopstown, T12 P928 Cork, Ireland)

  • Eoin Cowhey

    (Electricity Supply Board, Rosbrien Rd, V94 A5D2 Limerick, Ireland)

Abstract

When a distance relay protects a transmission line located on a dual circuit tower, a coupling effect will occur between the two circuits. Transposition of the circuits can reduce the mutual impedances, but this does not cater to the zero-sequence mutual coupling impedance during earth faults. As a result, the impedance measured by a distance relay under phase-to-earth fault conditions in these circumstances will not represent the correct impedance to the fault point unless these effects are taken into account. On multi-circuit lines, primarily if they operate in parallel, a zero-sequence mutual coupling should be considered when calculating settings for distance protection function. A 220 kV parallel line sharing the same tower was analysed using DigSilent Power Factory in the simulations. Phase-to-earth faults in different configurations were analysed on this system, and the reach of the protection relay was then estimated for operation. The results confirm how a protection relay can overreach and underreach in a distance protection scheme due to the influence of mutual coupling.

Suggested Citation

  • Michael O Donovan & Noel Barry & Joe Connell & Eoin Cowhey, 2021. "Mutual Coupling Compensation Techniques Used for Distance Protection of Parallel Lines," Energies, MDPI, vol. 14(7), pages 1-15, April.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:7:p:1982-:d:529621
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    Cited by:

    1. Gianfranco Chicco & Andrea Mazza & Salvatore Musumeci & Enrico Pons & Angela Russo, 2022. "Editorial for the Special Issue “Verifying the Targets—Selected Papers from the 55th International Universities Power Engineering Conference (UPEC 2020)”," Energies, MDPI, vol. 15(15), pages 1-8, August.

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